This is sample and hold module equipped with other minor circuitry to make it more versatile - clock and noise
generator. So far S&H core has been tested only and proven to be good enough. Dropout rate is in range of few mV
per minute, and pedestal error less than 5mV. This is however core performance and may be degraded by following
circuit - the lag. What you see in the picture is just panel with pots and knobs made to check ergonomics.

Panel

V-RAN pot:

adjust "Voltage Randomness", i.e. sampled random voltage amplitude

T-RAN pot:

adjust "Time Randomness", that is time variance of sample periods

CLOCK RATE knob:

tuning of S&H clock generator

SLOW/FAST switch:

choose clock tune range

LIN/EXP switch:

setting linear or exponential ramp of the lag circuit

TRIG/GATE switch:

in trigger position makes Sample and Hold, in gate position - Track and Hold

LAG knob:

controls sampled voltage rise/fall slope

LAG CV knob:

attenuator of external LAG CV input (modulation ammount)

RATE CV knob:

attenuator of clock generator CV input (modulation ammount)

SAMPLE pushbutton:

manual sample or track, depending on TRIG/GATR switch position

INPUTS:

2x signal IN, CV for clock (2) and lag (1), external clock

OUTPUTS:

2x OUT, clock, white and pink noise, and slow randomm

Preliminary specifications

desired clock frequency range:

0.05Hz-20kHz using knobs and external CV.

input/output level:

at least 18Vpp around center GND

dropout rate:

100uV/sec

offset error:

5mV

aperture time:

10us

Construction

The panel is made of 3.5mm thick aluminium. Painted with aluminium primer and several layers of various acrylic
spray paint to achieve slight "variable color" effect. Panel writings are made in PCB fab the same way as used
for PCB silkscreen. Not the most acurate, because they don't really care about silkscreen quality, but better results
can be achieved in any graphic company - see VCF page. It was then protected with acrylic
transparent spray paint. When panel is printed, the drilling can begin. Hollows around pot holes (about 2mm
deep), hide pot's nut, so knob can be mounted fraction of mm from the panel. It can be clearly seen on
empty panel photo and with knobs removed.